Migrate test block 7 to Dart 2.0.

tests/corelib_2/dynamic_nosuchmethod_test.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import 'dart:mirrors';
 
 // Test that noSuchMethod calls behave as expected for dynamic object invocations.
 class BaseClass {
   final dynamic finalField = "final!";
@@ skipping 57 matching lines @@
   Expect.throws(() => f.constructor(), (e) => e is NoSuchMethodError);
   Expect.throws(() => f.constructor = 42, (e) => e is NoSuchMethodError);
 
   Expect.throws(() => f.__proto__, (e) => e is NoSuchMethodError);
 
   // These are valid JS properties but not Dart methods.
   Expect.throws(() => f.toLocaleString, (e) => e is NoSuchMethodError);
 
   Expect.throws(() => f.hasOwnProperty, (e) => e is NoSuchMethodError);
 }